34006451EN/AC - Page 31
3. Appendix (to be carried out by qualified personnel only)

3.1 Mains 2 line protection

The rating of the mains 2 line upstream protection circuit-breaker must be chosen:
– to protect the static s witch thyristors with respect to maximum permissible currents. Refer to the table opposite for a 400 V
mains 2 voltage;
– to ensure discrimination with respect to the UPS output fuses (refer to fuse time-current curves below) and to the
downstream protective devices.
rated inverter output (kVA) maximum permissible current
800 19 In for 20 ms
900 19 In for 20 ms
Time-current curve 1600 A fuse
10-4
10-3
10-2
10-1
101
1
102
103
104
t(s)
103104105I(A)